CN115680629A - Casing outer armored optical fiber continuous positioning logging device and using method - Google Patents

Abstract

The invention relates to the technical field of exploration and development in the petroleum industry, and relates to a continuous positioning and logging device for armored optical fibers outside a casing and a method for using it. , orthogonal excitation coil and three-axis accelerometer; the orthogonal excitation coil is energized to generate excitation current, and the excitation current generates a magnetic field; the three-axis magnetic sensor array measures the distribution state of the magnetic field lines in the magnetic field; the three-axis accelerometer measures the gravity of the shell moving up and down acceleration. In the present invention, a control unit is set to control the orthogonal excitation coil to generate a magnetic field, the three-axis magnetic sensor array measures the distribution state of the magnetic force line and outputs it to the control unit, and the three-axis accelerometer measures the gravitational acceleration of the housing moving up and down and outputs it to the control unit. The unit calculates the orientation of the optical fiber relative to the casing, accurately locates the orientation of the optical fiber, and provides accurate optical fiber orientation data for directional perforation operations that do not damage the optical fiber.

Description

Casing outer armored optical fiber continuous positioning logging device and using method

technical field

The invention relates to the technical field of exploration and development in the petroleum industry, and relates to an armored optical fiber continuous positioning logging device outside a casing and a use method thereof.

Background technique

The downhole permanent optical fiber sensor is one of the current dynamic monitoring hotspot technologies. The existing casing optical fiber positioning logging tool completes the positioning of the optical fiber by installing an optical fiber protection card at the collar of the casing and measuring the orientation of the optical fiber protection card. However, In this logging method, when the azimuth angle of the optical fiber changes rapidly with the logging depth, the azimuth of the optical fiber protection card cannot accurately reflect the azimuth of the optical fiber, which makes it difficult for directional perforation, so it cannot guarantee that the optical fiber will not be damaged during the directional perforation operation.

Contents of the invention

The present invention provides a casing external armored optical fiber continuous positioning logging device and its use method, which overcomes the deficiencies of the prior art and can effectively solve the existing problem of using optical fiber protection cards for optical fiber positioning when the azimuth angle of the optical fiber varies. When the logging depth changes rapidly, the orientation of the optical fiber protection card cannot accurately reflect the orientation of the optical fiber.

One of the technical solutions of the present invention is achieved by the following measures: a continuous positioning and logging device for armored optical fiber outside the casing, including a casing with closed upper and lower ends, and a control unit and a three-axis magnetic sensor array are arranged in the casing , quadrature excitation coil and three-axis accelerometer;

The orthogonal excitation coil is energized to generate an excitation current, and the excitation current generates a magnetic field;

The three-axis magnetic sensor array measures the distribution state of the magnetic force lines in the magnetic field;

The three-axis accelerometer measures the gravitational acceleration of the shell moving up and down;

The control unit controls the orthogonal excitation coil to be energized, and at the same time collects the distribution state of the magnetic field lines measured by the three-axis magnetic sensor array, and collects the gravitational acceleration data measured by the three-axis accelerometer, and calculates the azimuth angle of the optical fiber.

The following is a further optimization or/and improvement to one of the technical solutions of the above invention:

The above-mentioned control unit may include a main control module, a power supply module and a communication module. The power supply module and the communication module are all connected to the main control module, and the three-axis magnetic sensor array, the orthogonal excitation coil and the three-axis accelerometer are all connected to the main control module.

The above-mentioned three-axis magnetic sensor array may include a plurality of three-axis magnetic sensors, and the plurality of three-axis magnetic sensors are coaxial with the casing and arranged in a circular array.

The above can also include an installation frame, the installation frame includes a support block, an upper fixed cylinder, a lower fixed cylinder and a fixed block, the outer side of the support block is provided with at least two fixed blocks in the radial direction, and each fixed block is far away from the side of the support block. It is fixedly connected with the inside of the shell, and the upper and lower ends of the support block are respectively fixed with an upper fixed straight cylinder and a lower fixed straight cylinder. The cross-excitation coil is set on the outside of the upper fixed straight cylinder.

The above-mentioned housing can be in the shape of a hollow cylinder, the upper end of the housing is sealed and fixed with an upper end cover, and the lower end of the housing is sealed and fixed with a lower end cover.

An outer ring groove may be provided on the outer side of the upper part of the housing.

The second technical solution of the present invention is achieved through the following measures: a method for using an armored optical fiber continuous positioning logging device outside the casing, comprising the following steps:

Slowly and synchronously lower the casing and optical fiber into the wellbore of the formation and fix them with cement slurry;

Put the shell as a whole into the inside of the casing;

The control unit is connected with an external host computer;

The control unit controls the quadrature excitation coil to be energized to generate an excitation current, and the excitation current generates a magnetic field;

The three-axis magnetic sensor array measures the distribution state of the magnetic field lines;

The three-axis accelerometer measures the gravitational acceleration of the shell moving up and down;

The control unit obtains the maximum magnetic field strength from the received magnetic field strength, and obtains the angle R _A between the maximum magnetic field strength and the horizontal direction of the three-axis magnetic sensor array, which is the azimuth angle of the three-axis magnetic sensor array;

The control unit obtains the gravitational acceleration of the shell moving up and down, and calculates the azimuth R _B of the three-axis magnetic sensor array relative to the bushing according to the following formula:

In the above formula, the axial direction of the casing is taken as the Z axis, and the plane perpendicular to the Z axis is used as the XoY plane. On the XoY plane, a certain direction of the casing is defined as the X axis, and the direction perpendicular to the X axis is the Y axis. The components A _X , A _Y , and A _Z of the acceleration of gravity on three axes can be measured through a three-axis accelerometer;

Add the maximum magnetic field intensity to the horizontal angle R _A of the three-axis magnetic sensor array and the azimuth R _B of the three-axis magnetic sensor array relative to the bushing to obtain the azimuth R of the optical fiber relative to the bushing, namely:

R = R _A + R _B .

In the present invention, a control unit is set to control the orthogonal excitation coil to generate a magnetic field, the three-axis magnetic sensor array measures the distribution state of the magnetic field line and outputs it to the control unit, and the three-axis accelerometer measures the gravitational acceleration of the housing moving up and down and outputs it to the control unit. The unit calculates the orientation of the optical fiber relative to the casing, and accurately locates the orientation of the optical fiber. The orientation cannot accurately reflect the orientation of the optical fiber, and provide accurate optical fiber orientation data for directional perforation operations that do not damage the optical fiber.

Description of drawings

Accompanying drawing 1 is the front view sectional structural schematic diagram of the embodiment of the present invention.

Accompanying drawing 2 is the top view structural diagram of the embodiment of the present invention.

Accompanying drawing 3 is the circuit structure diagram of the embodiment of the present invention.

Accompanying drawing 4 is the installation diagram when the present invention is used.

The codes in the drawings are: 1 is the housing, 2 is the control unit, 3 is the three-axis magnetic sensor array, 4 is the orthogonal excitation coil, 5 is the three-axis accelerometer, 6 is the support block, and 7 is the upper fixed cylinder , 8 is the lower fixed straight cylinder, 9 is a fixed block, 10 is an upper end cover, 11 is a lower end cover, 12 is an outer ring groove, 13 is a casing, 14 is an optical fiber, 15 is a formation, and 16 is a wellbore.

Detailed ways

The present invention is not limited by the following examples, and specific implementation methods can be determined according to the technical solutions of the present invention and actual conditions.

In the present invention, for the convenience of description, the description of the relative positional relationship of each component is described according to the layout of Figure 1 of the specification, such as: the positional relationship of front, rear, top, bottom, left, right, etc. It is determined according to the layout direction of Figure 1 of the specification.

Below in conjunction with embodiment and accompanying drawing, the present invention will be further described:

As shown in Figures 1 and 2, the embodiment of the present invention discloses a casing outer armored optical fiber continuous positioning logging device, which includes a casing 1 with closed upper and lower ends, and a control unit 2, three Axis magnetic sensor array 3, orthogonal excitation coil 4 and triaxial accelerometer 5;

The orthogonal excitation coil 4 is energized to generate an excitation current, and the excitation current generates a magnetic field;

The three-axis magnetic sensor array 3 measures the distribution state of the magnetic field lines in the magnetic field;

The three-axis accelerometer 5 measures the gravitational acceleration of the housing 1 moving up and down;

The control unit 2 controls the orthogonal excitation coil 4 to be energized, and at the same time collects the distribution state of the magnetic force lines measured by the three-axis magnetic sensor array 3 and the gravitational acceleration data measured by the three-axis accelerometer 5, and calculates the azimuth angle of the optical fiber 14.

The above casing 1 can be a high temperature and high pressure resistant casing 1 made of non-magnetic metal or composite material.

When in use, as shown in Figure 4, the casing 13 and optical fiber 14 are lowered synchronously and slowly into the wellbore 16 of the formation 15 and fixed by cement slurry, and the casing 1 is put into the inside of the casing 13 as a whole, and the control unit 2 Connected with an external host computer, the control unit 2 controls the orthogonal excitation coil 4 to be energized to generate an excitation current, and the excitation current generates a magnetic field. Due to the existence of the bushing 13 and the optical fiber 14, the magnetic force lines generated by the magnetic field are non-uniformly distributed. The distribution of magnetic force lines on one side is dense, and the distribution of magnetic force lines on the other side is sparse. Therefore, the distribution state of the magnetic force lines is measured by the three-axis magnetic sensor array 3, and the control unit 2 obtains the distribution state of the magnetic force lines to obtain the corresponding magnetic field strength. According to the size of the magnetic field strength Obtain the orientation of the three-axis magnetic sensor array 3, determine the relationship between the orientation of the three-axis magnetic sensor array 3 and the orientation of the optical fiber 14, obtain the azimuth angle of the optical fiber 14 relative to the horizontal direction of the three-axis magnetic sensor array 3, and the control unit 2 obtains the movement of the housing 1 up and down The gravitational acceleration of the three-axis magnetic sensor array 3 is calculated relative to the azimuth of the casing 13, and then the azimuth of the optical fiber 14 relative to the horizontal direction of the three-axis magnetic sensor array 3 and the three-axis magnetic sensor array 3 relative to the casing 13 The azimuth angles of the optical fiber 14 relative to the sleeve 13 are added to obtain the azimuth angle of the optical fiber 14 relative to the sleeve 13, and the azimuth angle of the optical fiber 14 relative to the sleeve 13 is output to the host computer.

According to needs, the optical fiber 14 can be armored optical fiber 14, by using armored optical fiber 14 of different materials and different structures, the high temperature resistance, high pressure resistance, tensile resistance, extrusion resistance and impact resistance of the optical fiber 14 are enhanced to ensure that the optical fiber 14 Integrity and patency during downhole operation, easy to adapt to the harsh environment of high temperature and high pressure downhole.

In summary, the present invention controls the orthogonal excitation coil 4 to generate a magnetic field by setting the control unit 2, the three-axis magnetic sensor array 3 measures the distribution state of the magnetic field lines and outputs it to the control unit 2, and the three-axis accelerometer 5 measures the movement of the housing 1 up and down. The gravitational acceleration is output to the control unit 2, and the control unit 2 calculates the orientation of the optical fiber 14 relative to the sleeve 13, and accurately locates the orientation of the optical fiber 14, which solves the existing problem of using the optical fiber protection card to locate the optical fiber 14. When the azimuth angle of 14 changes rapidly with the logging depth, the azimuth of the optical fiber protection card cannot accurately reflect the azimuth of the optical fiber 14, so as to provide accurate data of the azimuth of the optical fiber 14 for directional perforation operations that do not damage the optical fiber 14.

According to actual needs, the above-mentioned casing outer armored optical fiber continuous positioning logging device can be further optimized or/and improved:

As shown in Figure 3, the control unit 2 includes a main control module, a power supply module and a communication module, the power supply module and the communication module are connected to the main control module, the three-axis magnetic sensor array 3, the orthogonal excitation coil 4 and the three-axis accelerometer 5 are all connected with the main control module.

The above-mentioned power supply module is used to supply power to the main control module; the communication module can choose ZigBee, Bluetooth, WiFi and other wireless communication methods for communication between the main control module and the external upper computer; the main functions of the main control module are: 1. Through communication Communication between the module and the external host computer; 2. Collect the distribution state of the magnetic force lines measured by the three-axis magnetic sensor array 3, and calculate the orientation of the optical fiber 14 relative to the three-axis magnetic sensor array 3; 3. Collect the three-axis accelerometer 5 measured Based on the acceleration of gravity data, the orientation of the three-axis magnetic sensor array 3 relative to the sleeve 13 is calculated, and the orientation of the optical fiber 14 relative to the sleeve 13 is further calculated.

As shown in Figures 1 and 2, the three-axis magnetic sensor array 3 includes a plurality of three-axis magnetic sensors, which are coaxial with the housing 1 and arranged in a circular array. By arranging a plurality of three-axis magnetic sensors arranged in a circular array, the distribution state of the magnetic force lines in different directions is measured, which is convenient for accurate positioning.

As shown in accompanying drawings 1 and 2, it also includes an installation frame, the installation frame includes a support block 6, an upper fixed cylinder 7, a lower fixed cylinder 8 and a fixed block 9, and the outer side of the support block 6 is provided with at least two fixed blocks along the radial direction 9. The side of each fixed block 9 away from the support block 6 is fixedly connected to the inner side of the housing 1. The upper and lower ends of the support block 6 are respectively fixed with an upper fixed straight cylinder 7 and a lower fixed straight cylinder 8. The upper end of the upper fixed straight cylinder 7 is connected to the The three-axis magnetic sensor array 3 is connected, the lower end of the lower fixed cylinder 8 is connected with the three-axis accelerometer 5 , and the orthogonal excitation coil 4 is set on the outside of the upper fixed cylinder 7 .

By setting in this way, it is convenient to fix the orthogonal excitation coil 4 , the three-axis magnetic sensor array 3 and the three-axis accelerometer 5 inside the casing 1 .

As shown in Figures 1 and 2, the housing 1 is in a hollow cylindrical shape, the upper end of the housing 1 is sealed and fixed with an upper end cover 10 , and the lower end of the housing 1 is sealed and fixed with a lower end cover 11 .

Such setting prevents foreign matter from entering the inside of the housing 1 and enhances the pressure resistance of the housing 1 .

As shown in Figures 1 and 2, an outer ring groove 12 is provided on the outer side of the upper part of the housing 1 .

During use, if there is no liquid between the casing 13 and the housing 1, a sealing ring needs to be provided in the outer ring groove 12 to seal between the casing 1 and the outer ring groove 12; If there is liquid between 1, there is no need to install a sealing ring.

Embodiment 2: The embodiment of the present invention discloses a method for using an armored optical fiber continuous positioning logging device outside the casing, including the following steps:

S101, synchronously lowering the casing 13 and the optical fiber 14 into the well hole 16 of the formation 15 and fixing them with cement slurry;

S102, putting the casing 1 into the sleeve 13 as a whole;

S103, the control unit 2 is connected to an external host computer;

S104, the control unit 2 controls the orthogonal excitation coil 4 to be energized to generate an excitation current, and the excitation current generates a magnetic field;

S105, the three-axis magnetic sensor array 3 measures the distribution state of the magnetic field lines;

S106, the three-axis accelerometer 5 measures the gravitational acceleration of the housing 1 moving up and down;

S107, the control unit 2 obtains the maximum magnetic field strength from the received magnetic field strength, and obtains the angle R _A between the maximum magnetic field strength and the horizontal direction of the three-axis magnetic sensor array 3, which is the azimuth angle of the three-axis magnetic sensor array 3;

S108, the control unit 2 acquires the gravitational acceleration of the up and down movement of the casing 1, and calculates the azimuth R _B of the three-axis magnetic sensor array 3 relative to the bushing 13 according to the following formula:

In the above formula, the axial direction of the casing 13 is taken as the Z-axis, and the plane perpendicular to the Z-axis is taken as the XoY plane. On the XoY plane, a certain direction of the casing 13 (the reference axis of the tool surface) is defined as the X-axis, and the X-axis The orthogonal direction is the Y axis, and the components A _X , A _Y , and A _Z of the acceleration of gravity on the three axes can be measured through the three-axis accelerometer 5 ;

S109, add the maximum magnetic field intensity to the horizontal angle R _A of the three-axis magnetic sensor array 3 and the azimuth R _B of the three-axis magnetic sensor array 3 relative to the casing 13 to obtain the azimuth angle of the optical fiber 14 relative to the casing 13 R, namely:

R = R _A + R _B .

The above control unit 2 obtains the angle R _A between the maximum magnetic field strength and the horizontal direction of the three-axis magnetic sensor array 3, which is the azimuth angle of the three-axis magnetic sensor array 3, specifically including: is the X axis, then the control unit 2 measures the angle R _A between the maximum magnetic field intensity and the three-axis magnetic sensor array 3, that is, the angle between the maximum magnetic field intensity and the X axis is also R _A , and because the maximum magnetic field intensity is in the direction of the optical fiber 14 , the angle between the optical fiber 14 and the X-axis is also _RA .

The above technical features constitute the embodiment of the present invention, which has strong adaptability and implementation effect, and non-essential technical features can be increased or decreased according to actual needs to meet the needs of different situations.

Claims (9)

1. A casing outer armored optical fiber continuous positioning logging device is characterized in that it comprises a housing with closed ends at the upper and lower ends, and a control unit, a three-axis magnetic sensor array, an orthogonal excitation coil and a three-axis accelerometer are arranged in the housing ; The orthogonal excitation coil is energized to generate an excitation current, and the excitation current generates a magnetic field; The three-axis magnetic sensor array measures the distribution state of the magnetic force lines in the magnetic field; The three-axis accelerometer measures the gravitational acceleration of the shell moving up and down; The control unit controls the orthogonal excitation coil to be energized, and at the same time collects the distribution state of the magnetic field lines measured by the three-axis magnetic sensor array, and collects the gravitational acceleration data measured by the three-axis accelerometer, and calculates the azimuth angle of the optical fiber. 2. The casing outer armored optical fiber continuous positioning and logging device according to claim 1, wherein the control unit includes a main control module, a power supply module and a communication module, and the power supply module and the communication module are all connected to the main control module. The axial magnetic sensor array, the orthogonal excitation coil and the three-axis accelerometer are all connected with the main control module. 3. The casing outer armored optical fiber continuous positioning logging device according to claim 1 or 2, wherein the three-axis magnetic sensor array includes a plurality of three-axis magnetic sensors, and the plurality of three-axis magnetic sensors are coaxial with the housing and arranged in a circular array. 4. The casing outer armored optical fiber continuous positioning logging device according to claim 1 or 2, characterized in that it also includes an installation frame, the installation frame includes a support block, an upper fixed straight cylinder, a lower fixed straight cylinder and a fixed block, the support block There are at least two fixed blocks in the radial direction on the outer side of the body, and the side of each fixed block away from the support block is fixedly connected with the inner side of the housing. The upper and lower ends of the support block are respectively fixed with an upper fixed straight cylinder and a lower fixed straight cylinder. The upper end of the straight cylinder is connected with the triaxial excitation sensor array, the lower end of the lower fixed straight cylinder is connected with the triaxial accelerometer, and the orthogonal excitation coil is set on the outside of the upper fixed straight cylinder. 5. The casing outer armored optical fiber continuous positioning logging device according to claim 3, characterized in that it also includes an installation frame, the installation frame includes a support block, an upper fixed straight cylinder, a lower fixed straight cylinder and a fixed block, and the outer side of the support block There are at least two fixed blocks along the radial direction, and the side of each fixed block away from the support block is fixedly connected with the inner side of the housing. The upper and lower ends of the support block are respectively fixed with an upper fixed straight cylinder and a lower fixed straight cylinder. The upper end is connected with the triaxial excitation sensor array, the lower end of the lower fixed cylinder is connected with the triaxial accelerometer, and the orthogonal excitation coil is set on the outer side of the upper fixed cylinder. 6. The casing outer armored optical fiber continuous positioning logging device and method of use according to claim 1, 2 or 5, characterized in that the casing is hollow and cylindrical, the upper end of the casing is sealed and fixed with an upper end cover, and the casing is The lower end is sealed and fixed with a lower end cover; or/and, an outer ring groove is arranged on the outer side of the upper part of the housing. 7. The casing outer armored optical fiber continuous positioning logging device and its use method according to claim 3, characterized in that the housing is hollow and cylindrical, the upper end of the housing is sealed and fixed with an upper end cover, and the lower end of the housing is sealed and fixed with a The lower end cover; or/and, an outer ring groove is provided on the outer side of the upper part of the housing. 8. The casing outer armored optical fiber continuous positioning logging device and method of use according to claim 4, characterized in that the housing is hollow and cylindrical, the upper end of the housing is sealed and fixed with an upper end cover, and the lower end of the housing is sealed and fixed with a The lower end cover; or/and, an outer ring groove is provided on the outer side of the upper part of the housing. 9. A method for using a casing external armored optical fiber continuous positioning logging device, characterized in that it comprises the following steps: Slowly and synchronously lower the casing and optical fiber into the wellbore of the formation and fix them with cement slurry; Put the shell as a whole into the inside of the casing; The control unit is connected with an external host computer; The control unit controls the quadrature excitation coil to be energized to generate an excitation current, and the excitation current generates a magnetic field; The three-axis magnetic sensor array measures the distribution state of the magnetic field lines; The three-axis accelerometer measures the gravitational acceleration of the shell moving up and down; The control unit obtains the maximum magnetic field strength from the received magnetic field strength, and obtains the angle R _A between the maximum magnetic field strength and the horizontal direction of the three-axis magnetic sensor array, which is the azimuth angle of the three-axis magnetic sensor array; The control unit obtains the gravitational acceleration of the shell moving up and down, and calculates the azimuth R _B of the three-axis magnetic sensor array relative to the bushing according to the following formula:

In the above formula, the axial direction of the casing is taken as the Z axis, and the plane perpendicular to the Z axis is used as the XoY plane. On the XoY plane, a certain direction of the casing is defined as the X axis, and the direction perpendicular to the X axis is the Y axis. The components A _X , A _Y , A _Z of the acceleration of gravity on three axes are measured by a three-axis accelerometer; Add the maximum magnetic field intensity to the horizontal angle R _A of the three-axis magnetic sensor array and the azimuth R _B of the three-axis magnetic sensor array relative to the bushing to obtain the azimuth R of the optical fiber relative to the bushing, namely: R = R _A + R _B .

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